Fredrik Gløckner posted a history of Micro Four Thirds cameras and lenses on his Micro 4/3rds Photography blog. We own several of the lenses he mentions, and I think it’s a success story like few others in this industry. These are in my opinion the Toyota Corolla / VW Golf (Rabbit) of the system cameras. And the steadily climbing sales numbers show that they’re mainstream today.
Well worth a read.